Writers : Yazdanpanah,H.; Khatib, M.M.;Ahmadizadeh, S.S.
Refference : The first international applied geological congress; Department of geology Islamic azad university- Mashhad
Publishing Year : 2010

Abstract :

In March 9th, 2008 an earthquake with ML=5.1 occurred in Aryan-Shahr area, 55 km north of Birjand, East of Iran. More than 100 aftershocks were recorded within 8 days after the main shock. At first, the Sedeh fault with N76 trend was informed as source of this earthquake. But the distribution of aftershocks has been occurred in an ellipsoid district, that the long axe of this ellipsoid is not parallel with Sedeh Fault. The long axis of distribution ellipsoid of aftershocks (N120) is nearly perpendicular to the Sedeh fault trend.
Investigation of aftershock epicenter dispersal and the interpretation of aeromagnetic data make known the existence a blind fault parallel to long axis of distribution ellipsoid of aftershocks, which has been named Gheysar blind fault. The Gheysar blind fault with ~39 km length and trends of N126, appears to has a thrust component, and gently dipping (~20SW).

Subject List : Aftershock